Karan Johar's smashing blockbuster Kuch Kuch Hota Hai completes a run of 19 years today. And Kuch Kuch Hota Hai's release in 1998 was no less than a landmark for Bollywood. Millennials fell in love with Shah Rukh Khan, Kajol and Rani Mukerji in the characters of Rahul, Anjali and Tina. And the dialogues from "Pyar Dosti Hai!" to "Kuch kuch hota hai Rahul, tum nahi samjhoge" became etched in our memories forever.
Even though KKHH was Karan's first film, the behind-the-scenes from the sets were no less interesting. Here, we bring to you some rare facts you probably didn't know about Kuch Kuch Hota Hai: (Source: Photo by Express Archive/Dharma Productions)

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Karan Johar originally planned to cast Twinkle Khanna as the second lead and had even named the character Tina after Twinkle’s nickname, but was forced to make adaptations in the movie’s line-up after she turned the role down. And hence, Rani Mukerji came into the picture. (Source: Photo by Express Archive/Dharma Productions)

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Remember the iconic moment when Kajol’s sari flies away dramatically and catches Shah Rukh aka Rahul's attention in the song, ‘Ladki Badi Anjaani Hai’? It was initially a joke between Farah Khan and Karan Johar during the shoot but was later kept in the film (Source: Photo by Express Archive/Dharma Productions)

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Designer Manish Malhotra, Farah Khan, choreographer Geeta Kapoor, director Nikhil Advani, and even Karan Johar's mom, Hiroo Johar, have appeared in different cameos in the film and went unnoticed. (Source: Photo by Express Archive/Dharma Productions)

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Aman's role was first offered to Saif Ali Khan but he rejected it. And later, Salman Khan straight-forwardly asked Karan for the role when he met him at a bash thrown by Chunky Pandey.
(Source: Photo by Express Archive/Dharma Productions)

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Karan Johar even admitted in an interview that he thought that Kuch Kuch Hota Hai was "unusually silly" and Shah Rukh also agrees to the fact that his character Rahul was a selfish prick. (Source: Photo by Express Archive/Dharma Productions)

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In fact, Karan also revealed in an interview with CNN that he had first written a love triangle between a tomboy, a very pretty girl, and a slightly insensitive boy but that idea got shelved. Later, he came up with a story about a widower and his child, which got rejected as well. Eventually, the two were merged into one and Kuch Kuch Hota Hai was born. (Source: Photo by Express Archive/Dharma Productions)

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Remember the cute little Sardar boy whose only dialogue in the film was "Tussi Jaa Rahe Ho, Tussi Na Jao"? Looks like Shah Rukh was as much in love with him as us because when SRK's son Aryan visited the film's sets, he dressed him up just like him. (Source: Photo by Express Archive/Dharma Productions)

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Even Karan Johar cried during the reunion scene between Rahul and Anjali. (Source: Photo by Express Archive/Dharma Productions)

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Rani Mukerji was only 19 during shooting for the film. (Source: Photo by Express Archive/Dharma Productions)

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Shah Rukh and Kajol had promised to be a part of Karan's debut film when he was the assistant director on Dilwale Dulhania Le Jayenge. (Source: Photo by Express Archive/Dharma Productions)